Relief-valve.



No, 744.662. PATENTEDVNOV. 17, 1903..

W. D. WOOD.

RELIEF VALVE.

APPLICATION FILED AUG. 7, 1901.

N0 MODEL.

7. I i i 1:" IE

W[TWES8E8. INVENTOR.

' UNITE STATES Patented November 17, 1903.

PATENT OFFICE.

WILLIAM D. WOOD, OF LONDON, ENGLAND, ASSIGNOR TO FARRAND ORGAN COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

RELIEF-VALVE.

SPECIFICATION forming part of Letters Patent No. 744,662, dated November 17, 1903.

' Applioation filed August 7, 1901. Serial No. 71,245. (No model.)

' To all whom it may concern.-

Be it known that 1, WILLIAM D. Woon, a citizen of the United States, residing at London, England, have invented certain new and useful Improvements in Relief-Valves, of which the following is a specification, reference being had therein to the accompanying drawings.

It is the especial object of the invention to obtain a construction of relief-valve for pu mping-bellows which is operated by the air-pressure developed in place of being operated by the movement of the bellows, as in prior constructions.

To this end the invention consists in the peculiar construction of avalve provided with a pneumatic-motor for actuating the same, wherebythe increase of pressure beyond a certain point will cause the opening of the valve.

The invention further consists in the peculiar arrangement of said -motor and valve in relation to the pumping-bellows, as more fully hereinafter set forth.

In the drawings, Figure 1 is a front elevation of the wind-pumping bellows to which the improvements are applied. Fig. 2 is a cross-section thereof on line a; w. r

As shown in the drawings, the bellows is of ordinary construction, comprising the inclined stationary board A, upon the front face of which are arranged two pumping-bellows B and O and upon the rear face a store-bel-r lows D. The latter is provided with a spring a, which governs the pressure developed within the bellows. v

E is the relief-valve, which is adapted to normally close the port F, connecting with the interior of the bellows. erably arranged to connect with the pumpingbellows B and O in place of connecting with the store-bellows D, as is more common.

G is a pneumatic-motor for actuating the valve E and opening the port F. This motor is arranged to be held from operation until the actuating pressure reaches a certain point, which is the maximum pressure desired to be developed by the bellows. Thus whenever the This port is pref-- pressure developed by the pumping-bellows reaches this point the relief-valve will be opened, which will establish a direct connection between the bellows B and O and the external atmosphere, preventing further pumping from the bellows D. It is to be understood that the pneumatic-motor will not ordinarily be operated until the store-bellows D has been partially or almost completely col-- lapsed, so that the increased tension of the spring a. will cause the development of a greater differential air-pressure on the pneumatic,

a The valve E and pneumatic G may be placed in any suitable position; but a convenient arrangement is .to mount them upon the board A in'the'space between the storebellows B and O. This is shown in the drawings, in which the pneumatic G is of the ordinary bellows form and is directly connected by aport bin the board A with the space within the bellows D. Y 1

c is an arm connected to the movable board .of the bellows and extending beyond the hinged edge thereof. The free end of this arm is connected with the valve E and is adapted when the pneumatic G is collapsed to swing outward to uncover the port F.

The device as above described is adapted 'to be used either in connection with foot-operated wind musical instruments,such as cabinet-organs, or self-playing attachments for musical instruments having pneumatic-actions.- For the latter use it is especially applicable, as other attachments with which said instruments are provided may interfere with the complete collapsing of the store-bellows ordinarily necessary to operate relief-valves. With the construction described the valve is opened whenever pressure reaches a certain point regardless of the position of the storebellows.

What I claim as my invention is-- The combination with a store-bellows and a pair of pumping-bellows mounted upon the stationary board of said store-bellows, of a valve. normally closing a direct atmospheric In testimony whereof I affix my signature connection wiLh each of said pumping-belin presence of two witnesses.

lows, and a pneumatic-motor arranged between said pumping-bellows and having an 1 air connection with said store-bellows, said WILLIAM WOOD 5 pneumatic-motor being connected to said Witnesses:

valve whereby an abnormal air-pressure will open said direct atmospheric connection.

M. B. ODOGHERTY, H. 0. SMITH. 

